MP3Tag version 2.55a
iTunes version 18.104.22.168
Windows 7 Pro 64bit SP1
Looking at the Tag field mappings,
there is a RELEASETIME (TDRL) tag.
However, RELEASETIME does not appear in the Tag Panel.
Mp3tag Options dialog | Tag Panel menu item | Add field ... button | Edit field ... dialog
The Field list does not have "Releasetime".
Thanks in advance.